Products
Pipeline steel
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variety
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grades
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Delivery standards
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Purposes and characteristics
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Pipeline steel
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J55
X42/L290MB
X52/L360MB
X60/L415MB
X65/L450MB
X70 、X80
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Can be supplied as pernational standard, industrial standard, ASTM andDINor technical specification
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Pipeline steel is used mainly in oil, naturalgas athering andtransmitting andlong-distance transmitting or coal,ore, construction slurry materials transmitting. Products have precise size, good shape and high surface quality; its chemistry and performance have very little fluctuation, but entirely stable. X80 has passed the certification of General Administration of Quality, Inspection and Quarantine and Petroleum Pipeline Inspection Center.
The products are not only well sold to domestic Pipeline business for the key state projects of CNPC and CNOOC, but also exported to many large-scale steel enterprises in India, Korea and Iran etc.
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Main performance index
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grades
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Yield strength
(MPa)
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Tensile strength
(MPa)
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Yield ratio
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elongation
(%)
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20℃V –shape impact Akv(J)
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Dropstamp shearing area at -5℃(%)
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J55
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420-520
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520-600
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≤0.90
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≥30
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50-100
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-----
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X42
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340-440
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430-500
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≤0.90
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≥40
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130-180
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100
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X52
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390-520
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470-580
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≤0.90
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≥32
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150-200
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100
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X60
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440-550
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540-620
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≤0.90
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≥30
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160-250
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98-100
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X65
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470-580
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560-650
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≤0.91
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≥28
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160-250
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98-100
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X70
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510-600
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590-690
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≤0.92
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≥27
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180-380
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95-100
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X80
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580-700
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640-760
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≤0.93
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≥30
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270-450
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90-100（-15℃）
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Key process and technology guarantee
1.Chemical Composition Optimization. We adopt Low C + Mn + Nb, Ti, (Cr, Mo) compounding micro-alloying design to ensure high strength, high toughness, high plasticity and good welding performance.
2.Control technology on High purity liquid steel. Measures such as phosphorus control and deep desulphurization technology, calcium treatment, vacuum treatment, inclusion transformation process, vacuum degassing and full protection are adopted to ensure high purity and low inclusion content.
①We have stable control technology on carbon, so that there is very small carbon fluctuation in different heats.
②Deep desulphurization control technology: S is stable controlled at 0.004% or less, ultra-low sulfur steel with less than 0.002% S can be produced.
③ Low nitrogen control technology.
3.Rolling and cooling control technology. The combined strengthening role of micro-alloying elements as Nb and Ti are brought into full play to ensure the good micro-structure and stable performance.
4.Differentiation and diversification of production and supply, the individualized products can be provided according to users’ personal requests.
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dimension
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grades
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Delivery standards
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Purposes and characteristics
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Shipboard
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A、B、D、E、
A32、D32、E32、
A36、D36、E36
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Supply as per national standard, industrial standard, JIS, ASTM and DIN and technique specification etc
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Good surface quality and slab shape,high precise dimension, outstanding welding performance.
Mainly used for shipbuilding. Shipboard (level A and B) has passed CCS certification.
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Bridge steel
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Q235qC、D
Q345qC、D、E
Q370qC、D、E
Q420qC、D、E
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Supply as per national standard, industrial standard, JIS, ASTM and DIN and technique specification etc.
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Its product are matched between strength and toughness, fine fatigue resistance, good flexibility at low-temperature and atmospheric corrosion resistance; favorable surface quality, welding performance and low gap sensitivity.
Mainly used in railway, road and bridge construction.
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